Ok so after talking with my brother I've narrowed it down to this:
CPU: Intel Core i3 4130 3,4GHz Socket
Motherboard: Gigabyte GA-B85M-D3H
RAM: Kingston HyperX Fury Black DDR3 PC12800/1600MHz CL10 4GB
GPU: MSI Radeon R9 285 Gaming OC HDMI DP 2xDVI 2GB
Case: Cooler Master Elite 342
HDD: Kingston SSDNow V300 SV300S37A 120GB
PSU: Corsair CX500M 500W
OS: Win 8.1
This is a bit of a downgrade but I think it will suit him well as a gaming PC.
Also just want to say thank you for the help, I appreciate it!